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Arachnid Tire Pressure

Discussion in 'Model S' started by MartyL, Nov 30, 2017.

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  1. MartyL

    MartyL Member

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    What is the proper pressure for the Arachnid tires?
     
  2. Tech_Guy

    Tech_Guy ALWAYS IN LUDICROUS MODE! P90D>P100D Upgrade

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    I keep mine at 42 which I believe is the recommended pressure for 21” wheels
     
  3. MartyL

    MartyL Member

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    I ask because I just had them installed and the car's display says they are at 46.
     
  4. bishoppeak

    bishoppeak Member

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    Should be 42 cold front and rear
     
  5. MartyL

    MartyL Member

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    Thanks all.
     
  6. Tech_Guy

    Tech_Guy ALWAYS IN LUDICROUS MODE! P90D>P100D Upgrade

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    Agreed definitely check them in the morning when they are cold and adjust them to 42
     
  7. sumitkgarg

    sumitkgarg Member

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    same for 21inch turbines?
     
  8. bishoppeak

    bishoppeak Member

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    Yes
     
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  9. Miles88

    Miles88 Member

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    Had my Arachnids installed today on P85D. SC set tire pressures at 47 all around. Fairly harsh ride home. Lowered to 44 at home, and came here. Door sticker says 45 psi, but that’s for 19” Michelin Primacy.
     
  10. Tech_Guy

    Tech_Guy ALWAYS IN LUDICROUS MODE! P90D>P100D Upgrade

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    42psi for 21” wheels
     
  11. CSFTN

    CSFTN Member

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    Staggered vs square, pressure is the same?
     
  12. dark cloud

    dark cloud Active Member

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    Here's what I got from an older service manual. Tire pressures are pretty much adjust to taste; for 21" tires anywhere from 35 to 45 is safe, all long as you don't exceed the maximum stated on the sidewall of the tire, from there do you like a softer or firmer ride? The former might give a lower lap time, but the latter will yield higher range. Carrying 4 passengers and luggage on a road trip? increase them. Not many people do this.
    Screen Shot 2019-08-18 at 5.07.05 AM.png Screen Shot 2019-08-18 at 5.07.34 AM.png
     
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  13. AMPd

    AMPd Active Member

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    That info should be on the tire
     
  14. brookman

    brookman 2016 P90DL

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    Never go by the pressure on the tire. That is the recommended max. Always go by the pressure listed on the sticker on the door jamb of the driver's door.
     
  15. JPP

    JPP Active Member

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    ...so I will be deinstalling the OEM 19" wheels on my wife's 2015 S70D and installing the referral award 21" arachnids. Door sticker only reflects 19" tires so pressures (45 PSI) will not be correct. is there a 'replacement' door sticker with the correct pressures for the staggered 21s (I assume 42 PSI)?
     
  16. Tech_Guy

    Tech_Guy ALWAYS IN LUDICROUS MODE! P90D>P100D Upgrade

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    no you won't get a replacement door sticker though you could ask... just set your tires to 42 psi with the 21" and you will be fine
     
  17. FlatSix911

    FlatSix911 Porsche 918 Hybrid

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    The correct answer based on the Tesla chart is 40 PSI ... :cool:

    upload_2019-8-19_20-44-49.png
     
  18. JPP

    JPP Active Member

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    Thanks--wow, 40 PSI. Seems low for a Model S. The spec for my P3D+ and 20" square setup Michelins is 42.
     
  19. CSFTN

    CSFTN Member

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    I set all 4 for 42 psi
     
  20. JPP

    JPP Active Member

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    OK thx.
     

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